Just moments after an African American man was shot and killed by El Cajon police Tuesday, his sister was captured in an eyewitness video as she wept and screamed at officers, saying she told authorities her brother was mentally ill.

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In the video posted on YouTube (some explicit language), the mans sister said she told officers he was sick and needed help. She said she called police three times but instead should have called a crisis communication team.

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Dont you guys have a crisis communication team to talk to somebody mentally sick? she asked an officer.

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Why couldnt you tase him? she asked officers. Why, why, why, why?

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Amid outrage and protests over the death of the man identified as Alfred Okwera Olango El Cajons mayor vowed a full investigation and said the FBI has joined the probe of the incident.

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The most important thing to take away from this meeting today is a tragedy occurred In El Cajon yesterday. We lost a life. Nobody wants to see the loss of a life, Mayor Bill Wells said at a Wednesdayafternoon press conference. The family is devastated. The person who lost his life is devastated. Even the police officers involved in the shooting are devastated, and certainly the community is devastated.

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Wells also spoke of the death in personal terms. I saw a man who was distraught, a man who was acting out like he was in great pain. I saw him get gunned down and killed. If it was my son, I would be devastated.

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Most of the demonstrators voiced concerns that the shooting was racially motivated.

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By 1 p.m.Wednesday, a crowd of roughly 100 demonstrators had marched from the police station to the scene of the shooting several blocks away, as a cordon of roughly 25 San Diego County Sheriffs deputies stood nearby. The deputies wore riot helmets and held long wooden batons at port arms.

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During the march, protesters momentarily blocked traffic at the intersection of Magnolia and Main streets downtown. As car horns honked, either in protest or frustration, the demonstrators chanted black lives matter and thrust their fists in the air.

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Their foreheads dripping sweat under an unrelenting sun, activists held signs that read “release the 911 call” and No justice, no peace! a rallying cry heard at similar protests throughout the nation.